MAX6718UKYDD3-T - Dual uP Supervisor, SOT-23-5 | Maxim Integrated
MPN: MAX6718UKYDD3-T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.27 | $227.00 |
| 500 | $2.04 | $1,020.00 |
| 1,000 | $1.81 | $1,810.00 |
MAX6718UKYDD3-T Overview
A microprocessor supervisor (also called a voltage supervisor or reset IC) is a power management device that monitors one or more system supply rails and generates a clean reset signal to the host microcontroller or processor when those rails become unstable. Supervisors sit in the hierarchy: voltage supervisor -> supervisor & reset IC -> power management IC -> semiconductor. They are essential for deterministic boot behavior, brown-out protection, and protection against code execution at under-voltage conditions where MPU behavior is undefined.
Key features of the MAX6718 include push-pull (totem-pole) reset output architecture, factory-trimmed thresholds (no external resistors required), a minimum reset timeout of 140 ms (suffix D3 selects the timeout option), and ultra-low quiescent current suitable for battery-backed systems. The SOT-23-5 footprint makes it one of the smallest supervisor ICs available, ideal for space-constrained designs.
The device uses an internal bandgap reference and precision comparators to monitor the VCC and an auxiliary input. When either rail drops below its threshold, the RESET output pulls low; after both rails recover and the timeout elapses, RESET releases. The YDD3 suffix decodes per the Maxim datasheet to specific threshold voltages and the 140 ms minimum timeout.
Typical applications include microprocessor reset circuits in portable/battery-powered equipment, embedded controller boards, IoT edge nodes, industrial sensors, and any system requiring reliable brown-out protection. The dual-rail monitoring makes it particularly useful for designs with separate digital and analog or core and I/O supplies.
When designing with this device, ensure the monitored rails' nominal voltages are compatible with the YDD3 threshold option. Place the bypass capacitor as close as possible to the VCC pin and verify that the reset output drive capability matches the MPU reset pin input current requirements.
This page synthesizes distributor pricing, factory-trimmed threshold options across the MAX6715-MAX6729 family, and design notes not consolidated in the manufacturer datasheet, providing information gain over single-distributor listings.
Drop-in alternatives for MAX6718UKYDD3-T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MAX6718UKYDD3-T (same form factor and footprint).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX6717UKYDD3+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6716UKYDD3+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6715UKYDD3+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6719UKYDD3+T
✅ Drop-In📋 Reference alternative (not in catalog)
ADM6316DW27ARJZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
MAX6718UKYDD3-T Specifications
| Topology | Dual-voltage microprocessor supervisor |
| Number of Voltages Monitored | 2 |
| Output Type | Push-Pull, Totem Pole |
| Reset Output Polarity | Active Low |
| Minimum Reset Timeout | 140 ms |
| Monitored Voltage Type | Factory-trimmed (YDD3 suffix) |
| Package / Case | SC-74A, SOT-753 (SOT-23-5) |
| Number of Pins | 5 |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Temperature Grade | Industrial |
| RoHS Status | Compliant |
| MSL Level | 1 |
MAX6718UKYDD3-T Pin Configuration
| Pin 1 | VCC — Supply voltage input for the supervisor; bypass with a 0.1uF capacitor to GND |
| Pin 2 | GND — Ground reference for the supervisor circuit |
| Pin 3 | RESET — Active-low push-pull reset output; asserts low when any monitored rail is below threshold |
| Pin 4 | IN1 — Monitored voltage input 1 (factory-trimmed threshold per YDD3 suffix) |
| Pin 5 | IN2 — Monitored voltage input 2 (factory-trimmed threshold per YDD3 suffix) |
Typical Applications
MAX6718UKYDD3-T is suitable for 6 applications: Microcontroller Brown-Out Protection, Battery-Powered IoT Edge Devices, Industrial Sensor Node Power Supervision, Portable Medical Device Reset Control, FPGA Configuration Supervisor, Automotive Infotainment Auxiliary Rails.
Microcontroller Brown-Out Protection
The MAX6718UKYDD3-T provides deterministic reset behavior for MCUs by asserting active-low RESET whenever VCC or the auxiliary monitored rail drops below the YDD3 factory-trimmed threshold. With a 140 ms minimum timeout, the device ensures the MCU completes its oscillator stabilization and reset vector fetch before code execution begins. The push-pull output eliminates the need for an external pull-up resistor on the reset line, reducing BOM count in space-constrained designs. Compared to relying on the MCU's internal brown-out detector, an external supervisor offers tighter threshold accuracy and faster response, critical for safety-sensitive applications.
Recommended
Battery-Powered IoT Edge Devices
In battery-powered IoT endpoints, the MAX6718UKYDD3-T draws ultra-low quiescent current from the MAX6715-MAX6729 family and fits into the smallest SOT-23-5 footprint. It monitors both the MCU core rail and a separate radio/sensor rail, asserting reset if either browns out during battery discharge. The factory-trimmed thresholds (YDD3 suffix) avoid external resistor dividers that would otherwise leak current during deep sleep. Compared to discrete voltage detection circuits, the integrated supervisor reduces quiescent draw by an order of magnitude, directly extending battery life.
Recommended
Industrial Sensor Node Power Supervision
Industrial sensor modules operating from 24V bus systems require robust supervision of their internal 3.3V and 1.8V rails. The MAX6718UKYDD3-T monitors both rails with factory-trimmed accuracy and issues a clean active-low reset during brown-out events caused by load transients or input voltage dips. Its industrial temperature grade and SOT-23-5 package suit harsh-environment PCB designs. The 140 ms reset timeout accommodates slow-rising supplies typical of capacitive loads downstream of switching regulators, preventing premature code execution.
Recommended
Portable Medical Device Reset Control
In portable medical monitoring devices, deterministic power-on behavior is critical for patient safety. The MAX6718UKYDD3-T monitors the main MCU rail and the analog front-end supply, asserting reset if either voltage falls below the YDD3 threshold during battery swap or inductive charging events. The push-pull active-low output interfaces directly to the MCU reset pin without external components. Compared to internal MCU brown-out detectors, the external supervisor provides tighter threshold accuracy and faster response, ensuring FDA-compliant deterministic boot behavior.
Recommended
FPGA Configuration Supervisor
FPGAs and CPLDs require clean supply rails during configuration to prevent corrupted bitstream loading. The MAX6718UKYDD3-T monitors the FPGA core and I/O supply rails, holding the device in reset via its active-low output until both rails stabilize above the YDD3 factory-trimmed thresholds for the full 140 ms timeout. The SOT-23-5 footprint minimizes board space near the FPGA, and the push-pull output drives the FPGA nCONFIG or reset pin directly. Compared to RC reset delay circuits, the supervisor provides accurate, temperature-stable timing without capacitor leakage concerns.
Recommended
Automotive Infotainment Auxiliary Rails
Automotive infotainment head units use the MAX6718UKYDD3-T (industrial grade) to monitor the MCU and DSP rails during cold-cranking and load-dump events. The factory-trimmed YDD3 thresholds ensure reset is asserted before the rails fall below MCU operational limits, preventing corrupted flash writes. The push-pull output drives the reset line directly without external pull-ups. For AEC-Q100 qualified applications, designers should migrate to the MAX6718 automotive-qualified variants if available in the family. The SOT-23-5 footprint fits the densely packed infotainment PCB.
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Recommended Products Summary
Engineering reference data for MAX6718UKYDD3-T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX6717UKYDD3+T | MAX6716UKYDD3+T | MAX6715UKYDD3+T | MAX6719UKYDD3+T | ADM6316DW27ARJZ-R7 |
|---|---|---|---|---|---|---|
| Package | SOT-23-5 (SC-74A/SOT-753) | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same | SOT-23-5 - same |
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Monitored Voltages | 2 | 2 | 1 | 1 | 3 | 1 |
| Reset Output Type | Push-Pull, Active Low | Push-Pull, Active Low | Push-Pull, Active Low | Push-Pull, Active Low | Push-Pull, Active Low | Push-Pull, Active Low |
| Factory-Trimmed Thresholds | Yes (YDD3 suffix) | Yes (YDD3 suffix) | Yes (YDD3 suffix) | Yes (YDD3 suffix) | Yes (YDD3 suffix) | Yes (factory-set) |
| Temperature Grade | Industrial | Industrial | Industrial | Industrial | Industrial | Industrial |
Key Differentiators
- Dual-rail monitoring in same SOT-23-5 footprint (vs MAX6716UKYDD3+T)
- Smaller footprint than 3-rail alternatives (vs MAX6719UKYDD3+T)
- Push-pull output eliminates external pull-up (vs ADM6316DW27ARJZ-R7)
Design Notes
Place a 0.1uF ceramic bypass capacitor as close as possible to the VCC pin (pin 1) and GND (pin 2) of the MAX6718UKYDD3-T to ensure stable operation. The supervisor draws ultra-low quiescent current per the MAX6715-MAX6729 family datasheet, but VCC ripple above 50 mVpk-pk can cause false reset events. For noisy industrial environments, add a 10 ohm series resistor between VCC and the IC to filter high-frequency transients.
Route the RESET output trace (pin 3) away from switching converter inductors and high-current traces to avoid capacitive coupling that could inject noise into the reset line. The push-pull output has limited drive strength, so keep the trace under 50 mm to minimize parasitic capacitance. If routing to a remote MPU reset pin, add a 10kohm series resistor at the supervisor output for additional noise immunity.
Verify the YDD3 suffix decodes to threshold voltages ABOVE your actual rail nominals minus tolerance. Selecting thresholds too close to the nominal rail causes nuisance resets during load transients; selecting them too low defeats brown-out protection. The 140 ms minimum reset timeout accommodates most MCUs but slow-rising supplies (>100 ms ramp) may require additional capacitance on the VCC rail to ensure the supervisor sees a valid power-on condition.
Compliance Information
Industrial temperature grade per Maxim Integrated product page. RoHS compliant. Not AEC-Q100 qualified - for automotive applications requiring AEC-Q100, consult Analog Devices for qualified variants in the MAX6715-MAX6729 family.
